Viessmann Vitoligno 300-P Service Instructions For Contractors page 101

Repairs
(cont.)
LON communication module
LON LON LON
A Control unit or Vitocom 300
B Connecting cable, part no. 7143
495
C Terminator, part no. 7143 497
Function extension 0 - 10 V, part no. 7174 718
To default an additional set boiler water temperature via a 0 - 10 V input in the range
10 to 100 °C or 30 to 120 °C.
For signalling reduced mode.
F1
250mA (s)
L1 N
40
230V~
fÖ Power supply
aVF 0-10 V input
aVG KM BUS
LON LON LON
ON
OFF
S Ö P
A
157
Plug the module into the control unit.
The communication interruption will be
displayed (see page 82).
B
1 2 3 4
1 2 3
– +
144
aBJ Zero volt contact
A Main isolator (if required)
B DIP switch (see table)
Troubleshooting
1 2 3
145
101